Helps prevent over watering PLUS Retain essential nutrients Protects against over & underwatering Helps Promote Strong Root Development Excellent for raised beds and indoor or outdoor pots Heavy Duty Resealable Bag Pure Icelandic Pumice - The Only Soil Additive You Will Ever Need. Approximately 10 Pounds 100% Pure Icelandic Pumice. We source only the purest pumice from the Mt. Hekla Volcano in Iceland. The properties of pumice make it the best possible material to use in your gardening year round. From indoor house plants, to fields of crops, the pumice acts as an ideal growing media since it can store water while retaining oxygen, allowing the root system to grow stronger and thrive. Pumice allows microbial life to thrive while maintaining soil structure. Pumice retains nutrients which would otherwise drain through soil. Pumice has no harmful erosion, organic materials or byproducts. Pumice will retain moisture longer for healthier rooting systems. Pumice retains oxygen, important for plant health. Pumice absorbs runoff from harmful fertilizers. Pumice is environmentally clean. Pumice is extremely porous. Bag contains 8.5 Quarts of Icelandic Pumice.